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Photometry of Kuiper belt object (486958) Arrokoth from New Horizons LORRI

Buratti, Bonnie J.; Singer, Kelsi N.; Stern, S. Alan +12 more

On January 1st 2019, the New Horizons spacecraft flew by the classical Kuiper belt object (486958) Arrokoth (provisionally designated 2014 MU69), possibly the most primitive object ever explored by a spacecraft. The I/F of Arrokoth is analyzed and fit with a photometric function that is a linear combination of the Lommel-Seeliger (lunar) and Lambe…

The Eris/Dysnomia system I: The orbit of Dysnomia

Buie, M. W.; Grundy, W. M.; Holler, B. J. +1 more

We present new results on the Eris/Dysnomia system including analysis of new images from the WFC3 instrument on the Hubble Space Telescope (HST). Seven HST orbits were awarded to program 15171 in January and February 2018, with the intervals between observations selected to sample Dysnomia over a full orbital period. Using relative astrometry of E…

Io's SO₂ atmosphere from HST Lyman-α images: 1997 to 2018

Giono, Gabriel; Roth, Lorenz

The atmosphere of Jupiter's volcanic moon Io consists of mainly sulfur dioxide (SO₂), and this main constituent has been studied with a variety of observing techniques across many wavelengths over the years. Here we study absorption by SO₂ at the hydrogen Ly-α line (1216 Å) in a large set of images taken by the Space Telescop…

Jupiter's third largest and longest-lived oval: Color changes and dynamics

Hueso, R.; Sánchez-Lavega, A.; Rojas, J. F. +7 more

The transition region between the North Equatorial Band (NEBn) and North Tropical Zone (NTrZ) in Jupiter is home to convective storms, systems of cyclones and anticyclones and atmospheric waves. Zonal winds are weak but have a strong latitudinal shear allowing the formation of cyclones (typically dark) and anticyclones (typically white) that remai…